void lcd_write(bit start, uchar in_data)
{
uchar Hdata,Ldata;
while(lcd_busy());
Hdata=in_data&0xf0; //取高四位
Ldata=(in_data<<4)&0xf0; //取低四位
if(start==0)
LCD_RS = 0; //写入命令
else
LCD_RS = 1; //写入数据
LCD_RW = 0;
LCD_EN = 0;
delayNOP();
P0 = Hdata; //发送高四位
LCD_EN = 1;
delayNOP();
LCD_EN = 0;
delayNOP();
P0 = Ldata; //发送低四位
LCD_EN = 1;
delayNOP();
LCD_EN = 0;
delayNOP();
}
/*写数据 */
void write_data(uchar dat)
{
while(lcd_busy());
LCD_RS = 1;
LCD_RW = 0;
LCD_EN = 0;
P2 = dat;
delayNOP();
LCD_EN = 1;
delayNOP();
LCD_EN = 0;
}
void lcd_wdat(uchar dat)
{
while(lcd_busy());
LCD_RS = 1;
LCD_RW = 0;
LCD_EN = 0;
P0 = dat;
delayNOP();
LCD_EN = 1;
delayNOP();
LCD_EN = 0;
}
/*写指令数据到LCD */
void lcd_wcmd(uchar cmd)
{
while(lcd_busy());
LCD_RS = 0;
LCD_RW = 0;
LCD_EN = 0;
_nop_();
_nop_();
P2 = cmd;
delayNOP();
LCD_EN = 1;
delayNOP();
LCD_EN = 0;
}
//****************************************************************************
//Routine for reading a byte from MMC/SD-Card
//Software SPI
//****************************************************************************
unsigned char Read_Byte_MMC()
{
unsigned char temp=0;
unsigned char i;
SPI_DO=1;
for (i=0;i<8;i++) //MSB First
{
SPI_CLK=0; //Clock Low
if(Init_Flag)
delayNOP();
SPI_CLK=1; //Clock High
if(Init_Flag)
delayNOP();
temp=(temp<<1)|SPI_DO; //read mmc data out pin
}
return (temp);
}
/**********************************************************
* 检查LCD忙状态
* lcd_busy为1时，忙，等待。
* lcd-busy为0时,闲，可写指令与数据
**********************************************************/
bit lcd_busy()
{
bit result;
LCD_RS = 0;
LCD_RW = 1;
LCD_EN = 1;
delayNOP();
result = (bit)(P0&0x80);
LCD_EN = 0;
return(result);
}
//****************************************************************************
void Write_Byte_MMC(uchar value)
{
unsigned char i;
for (i=0;i<8;i++)
{
if (value&0x80)
SPI_DI=1; //Send bit by bit(MSB First)
else
SPI_DI=0;
SPI_CLK=0; //Clock low
if(Init_Flag)
delayNOP();
SPI_CLK=1; //Clock High
if(Init_Flag)
delayNOP();
value <<=1;
}
}
